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Question
Write the following sets in Roster form:
B = {p : p ∈ W and p2 < 20}
Solution
B = {P : P ∈ W and p2 < 20}
When p2 = 0
P = `sqrt(0)` = 0
When p2 = 1
P = `sqrt(1)` = 1
When p2 = 4
P = `sqrt(4)` = 2
When p2 = 9
P = `sqrt(9)` = 3
When p2 = 16
P = `sqrt(16)` = 4
∴ Roster form of the given set B = {0, 1, 2, 3, 4}
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